Layer and material-type dependent photoresponse in Se2/WS2 vertical heterostructures

Fu, ZhuangEn; Hill, Josh W.; Parkinson, Bruce; Hill, Caleb M.; Tian, Jifa

doi:10.1088/2053-1583/ac3c9c

Title: Layer and material-type dependent photoresponse in Se₂/WS₂ vertical heterostructures

Journal Article · Tue Dec 07 00:00:00 EST 2021 · 2D Materials

DOI:https://doi.org/10.1088/2053-1583/ac3c9c· OSTI ID:1906638

Fu, ZhuangEn ^[1]; Hill, Josh W. ^[1]; Parkinson, Bruce ^[1]; Hill, Caleb M. ^[1];

^[1]

Univ. of Wyoming, Laramie, WY (United States)

Abstract Transition metal dichalcogenide (TMD) heterostructures are promising for a variety of applications in photovoltaics and photosensing. Successfully exploiting these heterostructures will require an understanding of their layer-dependent electronic structures. However, there is no experimental data demonstrating the layer-number dependence of photovoltaic effects (PVEs) in vertical TMD heterojunctions. Here, by combining scanning electrochemical cell microscopy (SECCM) with optical probes, we report the first layer-dependence of photocurrents in WSe2/WS2 vertical heterostructures as well as in pristine WS2 and WSe2 layers. For WS2, we find that photocurrents increase with increasing layer thickness, whereas for WSe2 the layer dependence is more complex and depends on both the layer number and applied bias (Vb ). We further find that photocurrents in the WSe2/WS2 heterostructures exhibit anomalous layer and material-type dependent behaviors. Our results advance the understanding of photoresponse in atomically thin WSe2/WS2 heterostructures and pave the way to novel nanoelectronic and optoelectronic devices.

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Research Organization:: Univ. of Wyoming, Laramie, WY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0021281; 80NSSC19M0061; NNX15AI08H; CHE-2045593

OSTI ID:: 1906638

Alternate ID(s):: OSTI ID: 2335858

Journal Information:: 2D Materials, Vol. 9, Issue 1; ISSN 2053-1583

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Layer and material-type dependent photoresponse in Se2/WS2 vertical heterostructures

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Title: Layer and material-type dependent photoresponse in Se₂/WS₂ vertical heterostructures